Question

Definr . perpendicular and vertex​

Answer 1

Answer:

Perpendicular : Two lines are perpendicular when they intersect to form a 90∘ angle.

In the definition of perpendicular the word “line” is used. However, line segments, rays and planes can also be perpendicular.

Vertex : The vertex of an angle is the point where two rays begin or meet, where two line segments join or meet, where two lines intersect (cross), or any appropriate combination of rays, segments and lines that result in two straight "sides" meeting at one place